It appears Zeo, which declared it was shutting down in March, has taken a scorched earth policy in terms of developer firmware and libraries. All zeo websites are gone, and the sourceforge has been cleared out. I still had versions of the firmware and raw data API kicking around on my harddrive, and managed to fork the android project before the github account disappeared. I've thrown all of this on the openyou github account.
Zeo Firmware: http://github.com/openyou/zeo-firmware
Zeo Raw Data API: http://github.com/openyou/zeo-raw-data-api
Zeo Android API: http://github.com/openyou/zeo-android-api
Since most developers are used to looking for these kind of libraries on github, that seemed the best place to store them right now even though I certainly have no plans of doing any upgrades to them. The master branches will most likely stay as copies of the final versions so that others can have a reliable base to fork from.
For developers that want web accessible documentation, SleepStreamOnline (a project done by a Zeo intern a few years ago) is still around, and has web documentation for the raw data API available. Assuming this ever goes down, developers should also be able to generate their own version from the Raw Data API code using sphinx.